History
The district was created in 1972 when the former districts Rosenheim, Bad Aibling and Wasserburg am Inn were merged.

Geography
The Rosenheim district is located in the foothills of the Alps, the Chiemgau[?]. The landscape is dominated by moraines created by the Inn glacier in the last ice age, including many lakes. In the east of the district is the biggest of those lakes, the Chiemsee[?]. The main rivers in the district are the Inn and the Mangfall.
In the south of the district are the Chiemgauer Alpen and the Mangfallgebirge, which also contains the highest elevation of the district, the 1838m high Wendelstein.

The coat of arms shows the bavarian national symbol in the top. The two leaves in the left are taken from the Frauenchiemsee coat of arms, symbolizing the Chiemsee area of the district. The red lion in the right comes from the city of Wasserburg. The coat of arms was granted in 1976.